Tìm x, biết:
xy-x+2y-2=3
Giúp mik nha. Mik đang rất vội
a)4 . x - 15=-75 - x
b)72 - 3 . x=5 . x + 8
Giúp mik nha! mik đang rất vội
a) 4.x - 15 = -75 - x
=> 4x + x = -75 + 15
=> 5x = -60
=> x = -60/5 = -12
b) 72 - 3.x = 5.x + 8
=> -3x - 5x = 8 - 72
=> -8x = -64
=> x = -64/-8 = 8
Bài giải
a, \(4\cdot x-15=-75-x\)
\(4x+x=-75+15\)
\(5x=-60\)
\(x=-60\text{ : }5\)
\(x=-12\)
b, \(72-3\cdot x=5\cdot x+8\)
\(5x+3x=72-8\)
\(8x=64\)
\(x=64\text{ : }8\)
\(x=8\)
a, \(4\cdot x-15=-75-x\)
\(4x+x=-75+15\)
\(5x=-60\)
\(x=-60\text{ : }5\)
\(x=-12\)
b, \(72-3\cdot x=5\cdot x+8\)
\(5x+3x=72-8\)
\(8x=64\)
\(x=64\text{ : }8\)
\(x=8\)
tìm y :
Y x 4 + y x 3 + y = 720
Bạn nào biết giúp mik với mik hứa sẽ tick cho bạn!
Mik đang rất vội !!!
Y x 4 + y x 3 + y = 720
Y x 4 + y x 3 + y x 1 = 720
y x (4 + 3 + 1) = 720
y x 8 = 720
y = 720 : 8
y = 90
bài 1:a)5x^2-10xz+xy-2yz
b)9x^2-3x-y^2+y
c)y^2-z^2+12z-36
d)2y^2 -8z^2+(y-2z)^3
giúp mik đag vội
\(a,5x^2-10xz+xy-2yz\\ =5x\left(x-2z\right)+y\left(x-2z\right)\\ =\left(5x+y\right)\left(x-2z\right)\\ b,9x^2-3x-y^2+y\\ =\left(3x-y\right)\left(3x+y\right)-\left(3x-y\right)\\ =\left(3x-y\right)\left(3x+y-1\right)\\ c,y^2-z^2+12z-36\\ =y^2-\left(z-6\right)^2\\ =\left(y-z+6\right)\left(y+z-6\right)\\ d,2y^2-8z^2+\left(y-2z\right)^3\\ =2\left(y-2z\right)\left(y+2z\right)+\left(y-2z\right)^3\\ =\left(y-2z\right)\left(y^2-4yz+4z^2+2y+4z\right)\)
\(a,5x^2-10xz+xy-2yz\\ =5x\left(x-2z\right)+y\left(x-2z\right)\\ =\left(5x+y\right)\left(x-2z\right)\\ b,9x^2-3x-y^2+y\\ =\left(9x^2-y^2\right)-\left(3x-y\right)\\ =\left(3x-y\right)\left(3x+y\right)-\left(3x-y\right)\\ =\left(3x-y\right)\left(3x+y-1\right)\)
- |1,7 - x| - 5/3 = 2/3
Giúp mik vs mik đang cần gấp ạ
Cảm ơn
\(-\left|1,7-x\right|-\dfrac{5}{3}=\dfrac{2}{3}\\ \Rightarrow\left|1,7-x\right|=-\dfrac{5}{3}-\dfrac{2}{3}=-\dfrac{7}{3}\left(l\right)\)
Vậy không có giá trị x thoả mãn
(x+y)^3 - (x-y)^3
Giúp mik vs, mik đang cần gấp
\(\left(x+y\right)^3-\left(x-y\right)^3=x^3+3x^2y+3xy^2+y^3-x^3+3x^2y-3xy^2+y^3=6x^2y+2y^3\)
(x-3)x(y-5)=3
giúp mik với ạ mik đang cần í
\(\left(x-3\right)\cdot\left(y-5\right)=3\)
=>\(\left(x-3\right)\cdot\left(y-5\right)=1\cdot3=3\cdot1=\left(-1\right)\cdot\left(-3\right)=\left(-3\right)\cdot\left(-1\right)\)
=>\(\left(x-3;y-5\right)\in\left\{\left(1;3\right);\left(3;1\right);\left(-1;-3\right);\left(-3;-1\right)\right\}\)
=>\(\left(x,y\right)\in\left\{\left(4;8\right);\left(6;6\right);\left(2;2\right);\left(0;4\right)\right\}\)
1 Giải hệ phương trình:
sqrt(x + 2) - 3y = 3; 5sqrt(x + 2) - 2y = 71/3
Giúp mik giải hệ này với
=>5căn x+2-15y=15 và 5căn x+2-2y=71/3
=>-13y=4/3 và căn x+2-3y=3
=>y=-4/39 và căn x+2=3+3y=3-12/39=105/39
=>y=-4/39 và x=887/169
9/7 x x + 5/7 x x = 2/3
giúp mik nka
ai trả lời nhanh nhất mik tick cho nha
\(\dfrac{9}{7}\times x+\dfrac{5}{7}\times x=\dfrac{2}{3}\)
\(\dfrac{14}{7}\times x=\dfrac{2}{3}\)
\(x=\dfrac{2}{3}:2=\dfrac{1}{3}\)
tìm x biết:
27:(x-3/2)^3=(x-3/2):3
giúp mik với, mik cần gấp.
27:(x-3/2)^3=(x-3/2):3
Ta có: \(\dfrac{27}{\left(x-\dfrac{3}{2}\right)^3}=\dfrac{\left(x-\dfrac{3}{2}\right)}{3}\)
\(\Rightarrow\left(x-\dfrac{3}{2}\right)^3.\left(x-\dfrac{3}{2}\right)\)=27.3
\(\Rightarrow\left(x-\dfrac{3}{2}\right)^4\)=81
\(\Rightarrow\left(x-\dfrac{3}{2}\right)^4=3^4\)
\(\Rightarrow\left[{}\begin{matrix}x-\dfrac{3}{2}=4\\x-\dfrac{3}{2}=-4\end{matrix}\right.\)\(\Rightarrow\left[{}\begin{matrix}x=4+\dfrac{3}{2}\\x=-4+\dfrac{3}{2}\end{matrix}\right.\)\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{8}{2}+\dfrac{3}{2}\\x=\dfrac{-8}{2}+\dfrac{3}{2}\end{matrix}\right.\)\(\Rightarrow\left[{}\begin{matrix}x=\dfrac{11}{2}\\x=\dfrac{-5}{2}\end{matrix}\right.\)
Vậy x∈\(\left\{\dfrac{11}{2};\dfrac{-5}{2}\right\}\)